unsubscribe links are supposed to always be accompanied by a header with the same URL. X-Unsubscribe or smth like that. I guess a sneaky malware could make unsu

unsubscribe links are supposed to always be accompanied by a header with the same URL. X-Unsubscribe or smth like that. I guess a sneaky malware could make unsubscribe link a bad link, using the header to prevent clicking by the receiving server. You're right, this is interesting, something I have wondered about before.